lambie



(No Model.) 2 Sheets-Sheet l.

R. M. LAMBIE.

"BOOK HOLDER.

3atented Aug. 4, M385.

No. 323,511. l

(No Model.) 2 Sheets-Sheet 2.

R. M. LAMBIB.

BOOK HOLDER.

No. 323,511. Patented Aug. 4, 1885.

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UNITED STATES PATENT @Tirreno ROBERT' M. LAMBIE,

OF NEV YORK, N. Y.

BOOK-HOLDER.

SPECIFICATION Aforming part of Letters Patent No. 323,511, dated August4, 1885.

(No model.)

ieaves folded into a horizontal position. Fig. 3 is a face view of thesaid attachment. Fig.

i is a detail face view, partlyin section, of the Y lower portion of thesame, and Fig. 5, a top view ot' said lower portion.

This invention relates to certain improvements in book-holders of thekind having folding lcaveson alowerbook-support, and mechanism forplacing said leaves either in a horizontal position or in a verticalposition, and with mechanism likewise for regulating the distancebetween said leaves.

The invention consists, first, in the employment on such astructnre of acertain lockingbolt, by which the leaves may be locked in theirverticalposition, so that they cannot drop into the horizontal position untilthey are first unlocked.

The invention also consists in the new combination of a segment on thelower book-support, which segment has aprojecting tooth or prong, withthe swivel in which the lower booksupport is hung, and with a set-screwfor locking said segment.

In the drawings, the letter A represents the post or standard of abook-holder containing my invention. In the upper part of this post isswiveled a fork, B, which fork is capable of revolving horizontally onits lower upright extension, the same being shown at c in Fig. 4. In theupper part ol' the fork is pivoted, by a horizontal pin, 1:, the partwhich I have heretofore termed the lower book-support,77 and which ismarked by the letterC in the drawings. Fig. 5 shows a top view of thislower book-support, C, representing at d d the two plates on which theback of the book is to rest, and between these plates d d and par allelwith them a trough-like bar, c, which serves as a means of connectingthe. leaves D D with saidlower book-support, C. Theparts d cl and e. areconnected together by suitable braces, f. as shown in Fig. 5.

I will here rst describe the second part of my invention, which consistsin attaching to the under side of the piece C, and preferably casting inone piece therewith, a segment, g, which has its face notched, as shownin Figs. 3 and 4, and which segment is between the limbs of the fork B.This segment has at its lower end a downwardly-projecting tooth, lz,which, when the book-support C is in a horizontal position, comes inContact with an npwardly-extending tooth, i, that projects from thelower pin, a, between the limbs of the said fork. The stops h 'i limit,therefore, the motion of the book-support C around its pivot I) as Soonas the said book-support has attained its horizontal position; but whenthe said booksupportis to be inclined, as shown by dotted lines in Fig.et, the stops h. 'i do not interfere with the inclining thereof, butpermit it to the extent of the segment.

In the inclined position the book-support can be clamped by a screw, j,which has its bearing in one of the limbs oi the fork B, as in Figs. land 2, and which, when screwed np, bears against the segment g. enteringone ot the notches therein, thus locking-the segment in the desiredposition, and with it the-booksupport G.

I have now described how the book-support proper, C, is sustained on thepost A, and how it can be adjusted around its horizontal pivot b to theextent specified.

I will now proceed to describe my locking device for the leaves D l). Toeach of these leaves is fastened on the outer face thereof a slottedplate, E. By slotted77 I referto the vertical portion of said plate E,which is represented in Fig. 3, and which vertical portion is slottedalong its length, and at the same time this vertical slotted portion israised off the leaf D sufficiently far to allow the crosspin k, which isat the upper end of the link F, to travel in this slotted part of theplate E up and down without any danger of its coming ont of this slottedpart. The lower branches ot the plate E carry sockets I, which forni ibearings for the gudgcons in, that are formed ICO at the ends of ablock, G, which is adapted to slide on the trough-shaped bar e of thebook-support C. This block G has pivoted to it by a horizontalcross-pin, n, the lower end of the link F. NVhen the upper end of thelink F is in the lower part of the slot o of the casting E, as in Fig.3, the leai` D, to which such link and casting pertain, will be in theupright position; but when the upper end of the link F is in the upperpart of the said slot o, then the leaf to which it pertains will be inthe horizontal position.

So far as I have now described the parts D E F G and theirappurtenances, they are not claimed by mc as of my present invention.Substantially analogous structures are already in use; but my inventionas to this branch of the structure relates to means for locking the linkF when its upper end is in the lower part ofthe slot o. To this end Ihave pivoted into the upper portion of the plate or casting E, by ahorizontal pivot-pin, p, a bolt, I-I, which bolt has a handle-piece, q,at the top, and which with its l'ower part reaches into the slot o, soas to come above the upper end of the link F when the leaf D isvertical, as in Fig. 3. It is not eXa-etly necessary that the bolt Hshould with its lower end enter into the slot o, so long as it isadapted to rest above the cross-pin It when the leafD is upright. Aspring, r, is connected with the bolt H and its pivot p, so as tonormally hold the lower end of the bolt pressed inward and its upper endpressed outward. (See Fig. 1.) When the leaves D D are in the uprightposition, the two bolts H H are by their springs r held above the topcross-pin, la, of the links F F. They thereby prevent these links fromsliding upward in the slots o, and thus lock the leaves in the verticalposition. If it is desired to fold either one or both leaves down, 'thecorresponding` bolt or bolts H will have to be pressed inward at theirupper handlepiece, q, (see dotted lines, Fig. 1,) thereby carrying themaway from the top cross pin or pins 7c of the link or links F F, andallowing the said link or links to travel upward in the slot or slots ountil the leaf or leaves in ques tion attain the desired horizontalposition.

I find this part of my invention to be of importance, because, inthefirst place, it permits either one of the leaves to be folded down,while the other is positively looked, and it also holds the bookabsolutely protected by the leaves, preventing their accidental lorspontaneous depression.

I do not here claim anything that is shown or described in my Patent No.245,512, of August 9, 1881.

1. The combination of the leaf D, slotted plate E, and block G with thelink F, having upper cross-pin, k, and with the bolt H, which is adaptedto lock said link in its lower position when the leaf D is vertical,substantially as herein shown and described.

2. The combination of the fork B, having upwardly projecting tooth i andscrew` j,

with the booksupport C, Connecting pivotv pin b, segment g, and toothhon said segment, substantially1 as herein shown and described.

ROBERT M. LAMBIE.

